Migrate the dist rule of api_fingerprint.txt to Soong

...and remove the existing dist rule in Make to support dist'ing
api_fingerprint.txt in Make

Test: m droid dist --soong-only && ls -l out/dist/api_fingerprint.txt
Bug: 394365683
Change-Id: Ib4a8e3efe5404e6ddbf656f40e8ca9785cd6d5e7
diff --git a/android/makevars.go b/android/makevars.go
index d4389cf..c8eb5e4 100644
--- a/android/makevars.go
+++ b/android/makevars.go
@@ -651,6 +651,7 @@
 	for _, path := range paths {
 		copies = append(copies, distCopy{
 			from: path,
+			dest: path.Base(),
 		})
 	}
 	c.addDist(goals, copies)